JP2010063783A - Artificial joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial joint structure capable of quantitatively and three-dimensionally measuring and evaluating the balance of soft tissues on the inner side and outer side of an artificial joint by converting the operation of replacement of the artificial joint depending on the experience, intuition and subjectivity of an operator to the operation based on objective and highly reliable data. <P>SOLUTION: In the artificial joint structure, a joint in which ends of a first bone and a second bone are combined for the bending and stretching motions is replaced with an artificial joint. The artificial joint includes a first component coupled to the first bone side, and a second component coupled to the second bone side. The first component and the second component are configured to rotate and make joint motions as curved faces of both components are brought into contact with each other. One of the first or second component has a substitute component which can be substituted to be incorporated, and a plurality of sensors for measuring loads applied from the periphery when incorporated are disposed at prescribed positions in the substitute component. At least one triaxial load measuring sensor is included in the plurality of sensors. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an artificial joint used in orthopedics, and more specifically, in an artificial joint used in a procedure for replacing a knee joint, an ankle joint, etc. with an artificial one, the inside and outside of the joint during the procedure The present invention relates to a structure of an artificial joint that can easily adjust the load balance of the soft tissue, that is, can easily obtain the load balance of the soft tissue in the bent position and the extended position.

The human body has joints such as knee joints and ankle joints. For example, for knee joints, movements such as flexion and extension involve movements of the femur and tibia, and a series of complex at the ends connecting the femur and tibia. Articulated joints are formed so as to allow movement.
In particular, knees function when the knee functions, such as osteoarthritis of the knee, rheumatoid arthritis, bone tumors, and damage to the bones, articular cartilage, and ligaments of the knee when damaged or injured. A big impact on ability.
Therefore, various types of artificial knee joints have been developed in the field of orthopedics, and artificial knee joint replacement for replacing a deteriorated knee joint with an artificial knee joint has become widespread.

In the treatment method that replaces a deteriorated joint with an artificial knee joint, whether or not the soft tissue such as the medial and external collateral ligaments that control bending and stretching around the replaced artificial knee joint has acquired an appropriate load balance This judgment is very important.
The replacement knee prosthesis needs to move in the same way as that of the living knee joint, and in the technique of knee replacement, the inner and outer balance must be adjusted, that is, in flexion and extension positions. Obtaining a soft tissue load balance is very important to obtain good range of motion and stability after treatment.

Artificial knee joint replacement is performed by excising and adjusting the joint of the human body according to the shape, size, movement, etc. of the artificial knee joint, or by excising and adjusting the artificial knee joint side. In such a replacement operation, all of the procedures such as mechanical adjustment between “femur-artificial knee joint-tibia” and adjustment of the load balance between the inner and outer soft tissues are performed by the operator's skill, experience, It is left to subjectivity.
Therefore, the artificial knee joint of the patient who has undergone replacement cannot adjust the load balance between the inner and outer soft tissues well, and cannot secure a flexible and smooth joint movement like a living knee joint, May occur.

For this reason, in the replacement operation, the load balance between the surrounding inner and outer soft tissues is measured during the operation, and if this is appropriate, the possibility of successful replacement is extremely high.
If the knee prosthesis has a proper internal / external load balance, good clinical results such as proper alignment and bend angle can be obtained, and ideal performance of the knee prosthesis in the human body. As a result, the durability of the artificial knee joint itself can be enhanced.

In this way, it is very important to adjust the inner and outer load balance in the joint replacement procedure, but in the conventional technology, the inner and outer load balance is precisely measured and adjusted based on it. However, it was not easy to perform the operation, and the measurement and confirmation largely depended on the subjectivity of the practitioner or the surgeon.
In addition, even if it could be measured, only load data in one axial direction could be obtained, so that it was impossible to make a three-dimensional and precise measurement like an actual human body, and replacement was based on these data. Even if the knee joint part was adjusted during the procedure, it was unclear whether smooth joint movement like the original living knee joint could be secured.

Examples of documents related to the technical field of the present invention include the following.
JP 2008-62030 A JP-T-2007-520317

  In the present invention, in the replacement operation of the artificial joint, it is converted from the conventional operation depending on the experience, intuition, subjectivity, etc. of the practitioner and the surgeon to the operation based on objective and reliable data, It is an object of the present invention to provide an artificial joint structure capable of quantitatively measuring and evaluating the load balance between the soft tissue on the inside and outside of the body in a three-dimensional manner.

(1) In an artificial joint structure in which the joint portion that performs bending and extension motions by combining the ends of the first bone and the second bone is replaced with an artificial joint,
A first component coupled to the first bone side;
A second component coupled to the side of the second bone,
The first component and the second component are configured such that both curved surfaces come into contact with each other and rotate to perform a joint operation,
One of the first component or the second component comprises a configuration that can be replaced with an alternative component for alternative incorporation;
In a predetermined position of the substitute component, a plurality of sensors for measuring the load received from the surroundings when installed are arranged,
The plurality of sensors includes at least one triaxial load measuring sensor.

In the artificial joint structure (1),
The plurality of sensors may be composed of a combination of a triaxial load measuring sensor and a uniaxial load measuring sensor.
In the artificial joint structure (1),
The plurality of sensors may all be constituted by triaxial load measuring sensors.

(2) In an artificial joint structure in which both ends of the femur and tibia are combined with the meniscus sandwiched to perform knee flexion and extension movement, and the knee joint is replaced with an artificial joint,
A first component coupled to the side of the femur;
A second component coupled to the side of the tibia,
The first component has a first curved surface (convex surface), and the second component has a second curved surface (concave surface), so that both the curves are in contact with each other and rotate to perform a knee joint operation. Composed of
The second component comprises a configuration that can be replaced with an alternative component for alternative incorporation;
The joint includes a quadriceps tendon coupled to the femur, a patella tendon coupled to the tibia, and a patella therebetween.
A plurality of load measuring sensors including at least one triaxial load measuring sensor is disposed at a predetermined position of the substitute component in order to measure a load received from the surroundings when it is assembled.
In the artificial joint structure of (2),
A load measuring sensor for measuring a load received from the surroundings may be disposed on the patella.

In the artificial joint structure (2),
The plurality of sensors of the alternative component may be composed of a combination of a sensor for measuring a triaxial load and a sensor for measuring a monoaxial load, or all of the sensors for measuring a triaxial load. You may be comprised from the sensor.
The sensor disposed on the patella can be composed of a sensor for measuring a uniaxial load, but is more preferably composed of a sensor for measuring a triaxial load.

According to the present invention, in the replacement operation of an artificial joint, it is possible to measure the load balance between the inside and outside of the periphery three-dimensionally using a sensor for measuring a three-axis load, and to combine measured values at a plurality of positions. Totally accurate load balance can be determined.
The load balance value between the inside and outside is measured from multiple positions using a load measuring sensor including a triaxial load measuring sensor, and whether this value is appropriate or incorrect is adjusted each time in the replacement procedure. The replacement treatment of the artificial joint including the inner / outer load balance can be efficiently advanced.

By ensuring the appropriate balance between the inner and outer loads, it is possible to expect a good motion function of the artificial joint in the human body after the treatment, and as a result, the function and durability of the artificial joint itself can be improved.
As before, it will be converted from a procedure that relies on the subjectivity of the practitioner to a procedure based on objective data, and even if there are differences in the practitioner's skill, skill, experience, intuition, etc. It is possible to perform a replacement operation for an artificial joint that maintains a certain level of stability and stability.

In the present invention, the balance between the inside and outside can be obtained as a load value including three-dimensional data in the same state as when an artificial joint is actually incorporated, and based on accurate and reliable data, quantification with little individual difference Objective and objective balance evaluation becomes possible.
The artificial joint structure according to the present invention is not limited to the knee joint, and can be easily applied to other joints such as an elbow joint, an ankle joint, and a wrist joint.

Now, an embodiment of an artificial joint structure according to the present invention will be described with reference to FIGS.
FIG. 12 is an explanatory diagram showing the structure of the knee joint of the human body. Here, the end surfaces of the respective ends of the femur 30 and the tibia 40 are brought into contact with each other via the meniscus 62 and are in contact with each other, “quadriceps tendon 50-patella 51-patella tendon 52” on the front side. The two “collateral ligaments 60, 61” on both sides are joined to the side surfaces of the femur 30 and the tibia 40, and both ends of the femur 30 and the tibia 40 are integrated with the meniscus 62 interposed therebetween. Combined, a knee joint portion for performing knee flexion and extension motions is configured.

1 and 2 are diagrams showing an example in which an artificial joint is applied to a knee joint. FIG. 1 shows an artificial joint structure 100 when viewed from the side of the knee, and FIG. 2 shows an artificial joint structure when the knee is viewed from the back. 100.
In FIG. 1, "quadriceps tendon 50-patella 51-patellar tendon 52" is shown, but "collateral ligaments 60 and 61" are omitted.
The artificial joint structure 100 includes a femoral component 10 connected and joined to the femur 30, and a tibial component 20 joined and joined to the tibia 40, and the femoral component 10 and the tibial side are provided. The components 20 can come into contact with each other and rotate together to perform joint motion.

1 and 2, the downward end shape of the femur 30 is matched to the upward internal shape of the femoral component 10 so that they are combined together, and the upward end of the tibial side 40 is combined. The shape of the part is matched with the downward internal shape of the tibial component 20, and the two are similarly combined together.
Here, the femoral component 10 has a downwardly curved convex surface f1, and the tibial component 20 has an upwardly curved concave surface f2, and the curvature is in a region where both curved surfaces f1 and f2 are in contact with each other. The two curved surfaces f1-f2 are in contact with each other and are rotated with each other to perform a knee joint operation.

Next, the structure of the femoral component 10 and the tibial component 20 will be described with reference to FIG.
The femoral component 10 is made of a biocompatible material such as a titanium alloy, a chromium molybdenum alloy, or a medical ceramics. The outer shape generally forms a three-dimensional shape such as a substantially C shape or a semicircular shape, and faces downward. A curved convex surface f1 that contacts the tibial component 20 is formed as a surface.
In addition, the upper surface side of the femoral component 10 has a shape that matches the shape of the femur 30 whose end has been cut and formed by the treatment and is joined there, and is inserted into the downward end of the femur 30. Locking projections k1 and k2 for engaging with each other.

  The femoral component 10 is a member that is attached to the femur 30, cuts the bone by matching the end of the femur 30 with the shape of the upper side of the femoral component 10, and the osteotomy surface of the femur 30 is the upper inner surface. Install it in close contact with. At this time, by fixing the peg-like locking projections k1 and k2 from the upper surface and inserting them, it is possible to improve the adhesion of the femoral component 10 and the femur 30.

The tibial component 20 includes an articular surface plate A that receives the femoral component 10 and a base plate B that is attached to the upper end of the tibia 10 and supports the articular surface plate A.
Among these, the joint surface plate A is made of a medical resin material such as ultrahigh molecular weight polyethylene that is compatible with metal and friction, and in order to hold the curved convex surface f1 of the femoral component 10 in contact with it, The upper surface has a curved concave surface f2.

In addition, the back surface of the joint surface plate A is formed into a flat surface so as to be placed on and engaged with the base plate B. At this time, the base plate B is not misaligned. A predetermined engagement structure is provided on the side to receive the back surface of the joint surface plate A.
Then, in order to improve the position definition with the femoral component 10 and the consistency at the time of mutual movement, a protruding portion t1 of the base plate A is provided at the center of the upper surface, and this is inserted into the through hole T2 of the femoral component 10. Thus, it is configured to be disposed at a predetermined position.

  The base plate B is also made of a biocompatible metal, and has a structure in which the shape of the upper surface thereof is engaged with and engaged with the joint surface plate A. The mounting of the base plate B to the tibia 40 is the same as that of the femoral component 10, and the upper end of the tibia 10 is flattened to cut the bone, and the lower surface of the base plate B is shaped to match it. Then, in order to improve the bondability with the tibia 10, an engagement protrusion t <b> 2 is provided on the back surface of the base plate B, and this is protruded into the inside of the tibia 10 to be engaged with each other. It is fixed.

4 (1) is an external perspective view showing the tibial component 20, and the next FIG. 4 (2) is an external perspective view in a position where the front and rear of FIG. 4 (1) are reversed.
The tibial component 20 is configured as an integral member by engaging the lower surface of the joint surface plate A and the upper surface of the base plate B shown in FIG. A projecting portion t1 is provided on the upper surface of the tibial component 20 so as to be inserted into a predetermined position inside the femoral component 10, and a projecting portion joined to the upper end surface of the tibial component 20 on the lower surface. A portion t2 is provided.

By the way, when the artificial knee joint including the femoral component 10 and the tibial component 20 is replaced with a knee joint, its flexion, extension, rotation, and the like are greatly influenced by the ligament group like the living knee joint. Will be.
In FIG. 1 and FIG. 2, the main ligament groups involved in the stability of the knee joint during flexion and rotation operations are an inner collateral ligament 61 that is connected to the femur 30 and the tibia 40 above and below the knee. There is an outer collateral ligament 60 that is connected to the femur 30 and the tibia 40 on the upper and lower sides of the knee, and the patella 51 is connected to the patella 51 from the quadriceps 50 that is on the front surface and connected to the femur 30. There are a patella tendon 52 connected to the tibia 40 via, a sciatic leg muscle (not shown) existing behind the patella tendon.

FIGS. 5A and 5B are diagrams showing an alternative component 80. FIG. The substitute component 80 has a replaceable configuration for being incorporated in place of the tibial component 20, and the external perspective view of FIG. 4 (1) is a view corresponding to the tibial component 20 shown in FIG. 3 (2). is there.
Like the tibial component 20, this alternative component 80 has a structure in which two plate members 81 and 82 are combined, and a predetermined position between the plate members 81 and 82 is used to measure a load received from the surroundings. In addition, a plurality of load measuring sensors including at least one triaxial load measuring sensor are disposed.

The shape of the outer upper surface F2 of the alternative component 80 of FIG. 5 should be equivalent to the curved concave surface f2 of the tibial component 20 that combines the members A and B of FIG. A portion that is not in direct contact with the curved convex surface f1 can be omitted because it does not affect the load measurement.
In FIG. 5, the protruding portion t1 of FIG. 4 can be omitted because it is a portion that does not directly contact the curved convex surface f1, and the protruding portion t2 may also be omitted.
Thus, the alternative component 80 shown in FIG. 5 has a simple structure with few irregularities by omitting protrusions that are not related to load measurement. Therefore, in the knee joint replacement operation, this alternative component 80 is used instead of the tibial component 20. Workability for inserting the component 80 can be facilitated.

  The artificial joint structure of the present invention includes a sensor that quantitatively measures the load of the ligament group when the artificial joint to be replaced is actually attached to the joint. As shown in (2), five sensors S1 to S5 are provided at predetermined positions between the plate members 81 and 82 of the alternative component 80 in order to measure the load received from the surroundings when assembled. Among them, the center sensor S5 is constituted by a triaxial load measuring sensor.

FIG. 6 is a diagram in which five sensors S1 to S5 for measuring the load are arranged on the plate member 82 of the alternative component 80, and the center sensor S5 is for triaxial load measurement. The sensors S1 to S4 arranged in parallel on both sides are constituted by uniaxial load measuring sensors.
The load measuring sensors S1 to S5 disposed on the plate member 82 may be of any principle as long as the load can be measured. For example, if the strain meter outputs the magnitude of the load as an electric quantity, For example, it is general and easy to handle, and is easy to apply to the present invention.

  FIG. 6 is a plan view and a side view showing an example of the sensors S1 to S5 disposed on the plate member 82, and the femoral component 10 is centered on the surface of the sensor S5 for triaxial load measurement. Left and right 2 as “sensor S2 (front side) -sensor S1 (rear side)” on the right side and “sensor S4 (front side) -sensor S3 (rear side)” on the left side in the front-rear direction of the position in contact with the left and right curved convex surfaces f1. It shows what incorporated a total of 5 pieces.

The number, combination, and arrangement of sensors for uniaxial load measurement and triaxial load measurement here are merely examples of FIG. 6, and they depend on the structure of the joint part and the quality and quantity of measurement data. Can be set arbitrarily.
By installing as many as possible in a wide range of positions, a finer load distribution can be measured, and by increasing the proportion of sensors for triaxial load measurement, a more precise and three-dimensional load distribution can be measured. Become.

In FIG. 5, the load measuring sensors S1 to S5 are connected in a wired manner, and cords (c1 to c5) are drawn backward for each of the sensors S1 to S5. It is configured to be inserted / removed from the rear, and the substitute component 80 is disposed at a normal attachment position and is affected by “quadriceps tendon 50-patella 51-patellar tendon 52” on the front. And can be kept in a normal state.
The sensors S1 to S5 are wired. However, the present invention is not limited to this, and a wireless sensor that incorporates a small battery or the like and uses it as a power source to transmit output wirelessly can be used. In this case, since the conducting wire and its connection become unnecessary, there is an advantage that the structure is simple and does not get in the way during the treatment.

The alternative component 80 in FIG. 5 is designed to replace the tibial component 20 connected and joined to the tibia 40 as a prosthetic joint, and can be replaced with the regular tibial component 20 after the measurement of the load during the artificial joint operation is completed. It is what
As this alternative component 80, a component having the same shape as that of the actual tibial component 20 can be manufactured, and a sensor for measuring a load can be incorporated therein and used as the alternative component 80.

  In FIG. 6, two sensors S1 to S4 arranged in parallel on the left and right are uniaxial load measuring sensors, and measure only the load in the vertical direction “(z +) ← → (z−)”. Further, the sensor S5 arranged at the center is a triaxial load measuring sensor, and the vertical direction “(z +) ← → (z−)”, the horizontal direction “(x +) ← → (x−)”, the front-rear direction. The load in three directions “(y +) ← → (y−)”, that is, xyz 3-axis (three-dimensional) is measured.

Next, an example in which the ligament balance of the artificial knee joint to be replaced by the substitute component 80 is measured using the sensors S1 to S5 will be described with reference to FIGS.
The measurement of the ligament balance is performed after implanting and incorporating a predetermined femoral component 10 and tibial component 20 after osteotomy. In this case, the femoral component 10 is used as it is, but the tibial component 20 is used by replacing with the substitute component 80 as described above. Since this alternative component 80 incorporates the sensors S1 to S5, the load measurement is started by these sensors.

FIG. 7 shows a state in which the substitute component 80 in which the sensors S1 to S5 are arranged as shown in FIG. The data of the example measured are shown in FIG. 1. The vertical axis represents strain (με) and the vertical axis represents time (Sec).
Further, FIG. 7 (upper) is a load change diagram of each of the sensors S1 to S4 only in the z direction, and FIG. 7 (lower) is a three-axis load change diagram of the sensor S5 in the xyz direction.

  According to FIG. 7 (upper), the fluctuation of the sensor S4 in the upper left of FIG. It can be seen that a load is applied. At this time, the load of the sensor S5 in the center of FIG. 6 also fluctuates and the load in the z + direction (up and down) is the same as that of the sensor S4, but then it is applied in the x + direction (left and right). It is clear from the data that the load is large and that some load is applied in the y-direction (back and forth), and it can be seen that the operation is performed by applying a load in the left direction of the knee joint.

  According to FIG. 7, in addition to the sensors S1 to S4 that measure the load change only in the z direction, the sensor S5 that measures the triaxial load change in the xyz direction is used. The load applied to the "direction (left and right)" and the load applied to the "y + / y-direction (left and right)" can be measured, so that the joint is three-dimensionally measured with precision and close to the actual structure. The load distribution of the part can be determined.

Next, FIGS. 8-10 is a figure which shows the load fluctuation of only sensor S5 in the state different from the bending | flexion operation | movement of the knee joint of FIG.
First, in the measurement data of FIG. 8, a large load is applied in the “z + direction (downward in the vertical direction)” and “y + direction (in front of the front / rear direction)”, and almost no load is applied in the “x direction (left / right direction)”. Since fluctuation is not recognized, it can be determined that a load is mainly applied in the “y + direction (front-rear direction front)”.

In the measurement data of FIG. 9, the load in the “z + direction (downward in the vertical direction)” is large, but some load change is recognized in the “x− direction (after the front-back direction)”. Since the load hardly fluctuates in the “left-right direction”, it can be determined that the load is applied in the “x-direction (after the front-rear direction)”.
Furthermore, in the measurement data of FIG. 10, the load in the “z + direction (downward in the vertical direction)” is large, and the change in the load in the “x direction (horizontal direction)” is small. However, since there is a considerable load fluctuation, it can be determined that a load is applied in the “y-direction (after the front-rear direction)”.

In the present invention, the measurement data as shown in FIG. 7-10 is obtained by incorporating the load measuring sensors S1 to S5 incorporated in the substitute component 80 as shown in FIG. 6 instead of the artificial knee joint. Among these load measuring sensors S1 to S5, the sensors S1 to S4 measure the load only in the z direction, but the center sensor S5 exhibits a change in load in the three axial directions (three dimensions) in the xyz direction. It can be measured.
Further, in displaying the three-axis load change diagram in the “xyz” direction by the sensor for measuring the load in the three-axis direction (three-dimensional), in FIG. 7 (lower) and FIGS. Although it is displayed two-dimensionally as the above three-line graph diagram, it is preferable that it is displayed three-dimensionally as a three-dimensional vector waveform, and if it is displayed as such on the screen during treatment, Easy to understand.

  As described above, by using at least one of the plurality of sensors as a triaxial load measuring sensor, the load is measured in a three-dimensional direction, and is three-dimensionally precise and close to an actual load structure. In the form, it becomes possible to recognize and determine the load distribution of the joint part, the state after replacement of the artificial joint can be easily approximated to the state before the operation, and the technique for performing the artificial joint is improved. Can greatly contribute.

As an embodiment of the present invention, among the five sensors to be arranged, one sensor is a triaxial load measuring sensor, and four sensors are uniaxial load measuring sensors. It is preferable to use more of these three-axis type load measuring sensors.
In the three-axis load measuring sensor, the xyz axis is set as a three-dimensional axis that intersects each other at 90 degrees in the “vertical direction”, “left-right direction”, and “front-rear direction”. It is also possible.
The three-axis type load measuring sensor that is currently popular is expensive and has a slightly larger shape, so it is designed so as not to cause problems in terms of structure, compatibility, and cost increase. It is desirable.

  FIG. 11 is a block diagram of a measurement system using a plurality of sensors including a triaxial load measurement sensor. The measured values of the sensors (5 of S1 to S5) are amplified by an amplifier (AMP) 91, converted into a digital signal by an AD converter 92, further input to a microcomputer 93 (MC), and input to the microcomputer 93. These data are sent to a personal computer (PC) 94. At this time, an angle sensor for measuring the knee flexion / extension angle may be attached to the MC 93 outside the knee joint, and the measured value may be input through the AD converter 92.

The PC 94 has a display and can display a screen. On the screen, a plan view of an alternative component 80 similar to that shown in FIG. 5 (2) with five load sensors (S1 to S5) attached and a sensor layout diagram thereof are displayed, and measured values of loads by the sensors S1 to S5. Is displayed at each position.
In the plan view image, the center of gravity (G) calculated by the MC 93 based on the data sent from the load sensors S1 to S5 is displayed in a dot matrix.
Then, on the display screen, the “knee flexion / extension angle” measured by the angle sensor, the “total load” obtained by summing up the measurement values of the load sensors S1 to S5, the coordinate value of “center of gravity coordinates”, and the like are also displayed. Good.
Here, the data taken in for the load measurement is stored in the PC 94.

In the artificial joint structure of the present invention, the artificial joint practitioner operates the replaced artificial knee joint appropriately during the artificial knee joint replacement operation, and loads distribution data obtained from the load measurement sensor From the display displayed based on the above, it is possible to easily determine whether or not the surrounding load has acquired an appropriate balance.
Based on the load distribution data, the joint is excised and adjusted according to the structure of the artificial knee joint, or the artificial knee joint is excised and adjusted according to the joint. The treatment can be performed so as to ensure smooth joint movement equivalent to that of a living knee joint.
Furthermore, the measured load distribution data is objective and makes it easy to judge the load distribution data, and in the replacement of the artificial joint, the operation depends on the experience, intuition, subjectivity, skill level, etc. Therefore, it is possible to provide an artificial joint structure that can be converted into a treatment based on a high load data distribution, and that the balance between the soft tissue inside and outside the artificial joint can be quantitatively measured and evaluated three-dimensionally.

An example in which an artificial joint is applied to a knee joint is shown, and the artificial joint structure 100 is seen from the side of the knee. It is a figure when the artificial joint structure 100 of FIG. 1 is seen from the back surface of the knee. It is an external appearance perspective view which shows the femoral side component 10 used by the artificial joint structure of this invention, and the tibial side component 20 decomposed | disassembled. It is an external appearance perspective view which shows the tibial component 20 used with the artificial joint structure of this invention. It is structure explanatory drawing which shows the alternative component 80 used with the artificial joint structure of this invention. It is explanatory drawing which shows the member incorporating the load measurement sensor used with the artificial joint structure of this invention. It is a figure which shows the 1st measurement data by the load measurement sensor used with the artificial joint structure of this invention. It is a figure which similarly shows the 2nd measurement data by a load measurement sensor. It is a figure which similarly shows the 3rd measurement data by a load measurement sensor. It is a figure which similarly shows the 4th measurement data by a load measurement sensor. It is a figure which shows an example of the measurement system by the load measurement sensor used with the artificial joint structure of this invention. It is explanatory drawing which shows the structure of the knee joint of a human body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Artificial joint structure 10 Femoral side component 20 Tibial side component f1 Upward curved convex surface (1st curved surface) of femoral side component
f2 Downward curved concave surface of the tibial component (second curved surface)
A Tibial component articular surface plate B Tibial component base plate 80 Alternative components
81, 82 Plate member of substitute component F2 Upper surface of outside of substitute component S1-S4 Sensor for uniaxial load measurement S5 Sensor for triaxial load measurement 30 Femur 40 Tibial
50 quadriceps tendon 51 patella 52 patella tendon 60, 61 collateral ligament 62 meniscus

Claims (3)

In the artificial joint structure in which the joint portion configured to bend and extend by combining the ends of the first bone and the second bone is replaced with an artificial joint,
A first component coupled to the first bone side;
A second component coupled to the side of the second bone,
The first component and the second component are configured such that both curved surfaces come into contact with each other and rotate to perform a joint operation,
Either one of the first component or the second component has a configuration that can be replaced with an alternative component to be incorporated instead.
A plurality of load measuring sensors for measuring the load received from the surroundings when installed in the alternative component are disposed,
The artificial joint structure, wherein the plurality of sensors includes at least one triaxial load measuring sensor. In the artificial joint structure in which both the ends of the femur and tibia are combined with the meniscus sandwiched to perform knee flexion and extension movement, the knee joint is replaced with an artificial joint.
A first component coupled to the side of the femur;
A second component coupled to the side of the tibia,
The first component has a first curved surface, the second component has a second curved surface, both curved surfaces are in contact with each other, and are configured to perform knee joint movement,
The second component comprises a configuration that can be replaced with an alternative component for alternative incorporation;
The joint includes a quadriceps tendon coupled to the femur, a patella tendon coupled to the tibia, and a patella therebetween.
A plurality of load measuring sensors including at least one triaxial load measuring sensor is disposed at a predetermined position of the substitute component in order to measure a load received from the surroundings when the substitute component is mounted. Artificial joint structure. The artificial joint structure according to claim 2,
A load measuring sensor for measuring a load received from the surroundings is disposed on the patella.

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